
package org.apache.solr.servlet;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringEscapeUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.solr.core.CoreContainer;

/**
 * A simple servlet to load the Solr Admin UI
 * 
 * @since solr 4.0
 */
public final class LoadAdminUiServlet extends HttpServlet {

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {

        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html");

        PrintWriter out = response.getWriter();
        InputStream in = getServletContext().getResourceAsStream("/admin.html");
        if (in != null) {
            try {
                // This attribute is set by the SolrDispatchFilter
                CoreContainer cores = (CoreContainer) request.getAttribute("org.apache.solr.CoreContainer");

                String html = IOUtils.toString(in, "UTF-8");

                String[] search = new String[]{
                    "${contextPath}",
                    "${adminPath}"
                };
                String[] replace = new String[]{
                    StringEscapeUtils.escapeJavaScript(request.getContextPath()),
                    StringEscapeUtils.escapeJavaScript(cores.getAdminPath())
                };

                out.println(StringUtils.replaceEach(html, search, replace));
            }
            finally {
                IOUtils.closeQuietly(in);
            }
        }
        else {
            out.println("solr");
        }
    }

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {

        doGet(request, response);
    }
}
